I used this method building my tanks and finishing them up last week. I can honestly say it made the job pretty easy,,,,,, enjoyable in fact. There is no way I would build my tanks any other way. I still have to install the vent lines and close up the backs so I can not say weather or not I will have any leaks, but using this method allows you to take your time working, setting the rivets, carefully inspecting all the sealing areas and covering them up when set. I found that if I used a heat gun on low power, or a hair drier, the pro-seal would flow a lot easier. I did mine in stages. First I sealed and clecoed the short stiffiners and the "J" stiffener. After cure I cleaned up the holes, dabbed them with fresh pro-seal, back-riveted, covered up the rivet shop heads and filleted both sides of the stiffiners, removed my electrical tape I put down as a guide, cleaned up the pro-seal where it wasn't supposed to be and let cure again. After cure I again cleaned with MEK and inspected carefully, dabbing pro-seal where needed, then installed the ribs. I found that it was easiest to start outside the jig. Starting in the middle, I buttered up a rib and started at the most forward hole on the top side and clecoed the first three holes. I did this one rib at a time only clecoing the first three holes on the top side of the skin. This held the ribs straight and the spring of the skin kept the unclecoed holes away from the skin so pro-seal was not getting all over. When all the ribs were installed with the first three holes on the top, I flipped it over on the bench and did the bottom three holes. I found doing it this way your not fighting trying to push down on the ribs to get the holes lined up, you are pretty much just wrapping the skin around the ribs starting at the forward holes. The tank was now taking shape, the ribs were lined up where they were supposed to go, and I did three more holes up on each side. I then slipped the tank into the jig and finished up the clecoing, doing a few holes at a time on each side working my way up (aft). I buttered up the ribs heavier on the bend side,,,,this gave a nice squeeze out that I ran a Popsicle stick over to give a nice fillet seal. Its cold here so I keep the shop at 55* when I am not in it so I fashioned up a temporary heat box to put the tanks in to cure for a few days.. Again, after cure I unclecoed, cleaned up the rivet holes, set the rivets in a dab of pro-seal, and with the help of a friend bucked all the rib rivets and covered up the shop heads. One other thing,,,,after I placed the rivets in the holes with Pro-seal, I pushed them in flush, wiped off the squeeze out and ran a strip of rivet tape over the rivets. This minimized the squeeze out mess on the tools, ect. I was generous with the Pro-seal and am confident I will not have any leaks,,,,,,at least I am hoping I won't!